I noticed Solid Edge in help. It's giving a good definition on moving multiple parts in assembly.
I wanted to see if You Tube has any videos on this topic. I didn't see anything.
Go to Solution.
It's a matter of sellecting the parts/assemblies and using the CTRL key to add or remove each then use the Steering Wheel in classic Sync style.
As pointed out the dialog screen as to how Sync will edit your relationships is a bit confusing, but with a little help you can figure it out.
watch here: http://screencast.com/t/IVJk8dT0h